The Giants put Ryan Vogelsong on the 15-day disabled list Tuesday and prepared to be without their right-hander for two months in yet another challenge for their struggling starting rotation.

Vogelsong had surgery Tuesday morning at Stanford, one day after breaking his pitching hand while at the plate. The expected recovery time is 4-6 weeks, but Vogelsong likely would need a rehab assignment before rejoining the Giants.

X-rays revealed he broke two bones in his right pinkie area and also dislocated a knuckle that couldn’t be immediately popped back into place by the medical staff, Vogelsong said. He was hurt on a fifth-inning swing when he chased an inside fastball from Craig Stammen during an 8-0 victory against the Washington Nationals.

The injury came as Vogelsong was putting up his best outing of the year and felt like his former dominant self. He had a 6-0 lead at the time of his injury, and had pitched five scoreless innings for his first victory since April 11, snapping a six-start winless stretch.

Considering all of Vogelsong’s comebacks in a journeyman career that has taken him to Japan and back to the big leagues, nobody doubts the 2011 All-Star will bounce back again — in plenty of time to get back on the mound before 2013 is done.

“He’s a little down, which is to be expected,” manager Bruce Bochy said late Monday. “He’ll be back, hopefully in a couple of months.”

The 35-year-old Vogelsong, who received an $8.3 million, two-year contract in January 2012, said he hopes the fact that he injured his pinkie could allow him to return more quickly.

“If it’s going to be one, that’s the one to do,” he said. “It doesn’t do much on the baseball, it just goes along for the ride.”

Vogelsong won 14 games last season — three during the franchise’s run to a second World Series championship in three years — and was a 13-game winner in his comeback year in 2011. Last fall, he won Game 3 of the World Series at Detroit’s Comerica Park as the Giants went on to sweep the Tigers in four games.

But he’s off to a slow start this year, and he’s not alone. The Giants’ typically steady starters — Madison Bumgarner, Barry Zito, Tim Lincecum and Tuesday night’s pitcher, Matt Cain — began the day with a 4.78 ERA.

Right-handed reliever Santiago Casilla also went on the disabled list Tuesday because his troublesome right knee still isn’t fully healed despite the use of two different braces.

Infielder-outfielder Brett Pill and right-hander Sandy Rosario were recalled from Triple-A Fresno to help fill the voids for the reigning World Series champions.

The Giants were still working to figure out how to cover Vogelsong’s spot in the rotation, though the club has some time because San Francisco doesn’t need a fifth starter until next Tuesday’s Bay Bridge interleague matchup against the A’s.

While Bochy likes having versatile right-hander Chad Gaudin as a long reliever out of the bullpen, he has starting experience and could fill in, while lefty Mike Kickham also is “in the mix” for consideration, Bochy said Tuesday. Kickham is 2-4 with a 4.72 ERA with 50 strikeouts and 19 walks in nine starts for Fresno.